Vertical grinding machine



.1934. G. M. LE TARTE VERTICAL GRINDING MACHINE Filed Feb. 23 1932 W R Y A W WW M q \y J m Wk M M e H *w m KM n w Patented July I0, 1934 stares "burrs PATENT orrics 2 Claims.

highly eliicient in use.

Another object of the invention is the provision of a device of this class whereby all hand stoning of the die sections may be eliminated and all decarbonized surfaces on the cutting face or edge of the die easily and quickly removed, thus giving greater life to the die for each grinding.

Another object of the invention is the provision of a work piece supporting table which may be tilted relatively to the axis of the grinding wheel and which may be moved axially of the grinding wheel so as to always properly maintain the desired relative position between the grinding wheel and the work piece being ground.

Another object of the invention is the provision in a structure. of this nature that all of the operating mechanism is below the work piece supporting table so that the work piece may be easily and quickly removed for inspection without varying or changing the set up of the machine and the various adjustable parts.

Another object of the invention is the provision of means for moving the work piece supporting table vertically and a counterweight for counterbalancing the vertically movable work piece supporting table and its connected parts.

Another object of the invention is the provision in a device of this class of a dressing tool carrying mechanism whereby the grinding wheel may be dressed true and in which operation the axially movable table will cooperate.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement or parts hereinafter described and claimed.

The invention will. be best understood by a ref rence to the accompanying drawing which forms a part of this specification, and in which,

Fig. 1 is a central vertical sectional View of the invention, with parts broken away.

Fig. 2 is a side elevational view of the invention.

Fig. 3 is a sectional view taken on line 33 of Fig. 1.

Fig. 4 is a central vertical sectional view of the dressing tool holder.

Fig. 5 is a sectional view taken on line 5-5 of Fig. 4.

As shown in the drawing, I provide a housing or base 9 secured to the upper face of which and projecting upwardly. therefrom 'is a supporting standard 10 which is formed tubular. Slidably embracing the standard 10 is a head 11. Rotatably projected through one side of the head 11 is a rod 12 on which is fixedly mounted a gear 13 engaging in the recess 14 formed in the head. and adapted to mesh with a rack bar 15 which is fixedly mounted on and extended axially of the supporting standard 10. A hand wheel 16 is fixedly mounted on the shaft 12 for rotating the same.

A plate 17 is mounted on the upper end of the standard 10 to serve as a support for the motor 18 positioned within the housing 18. The shaft 19 of the motor projects above the deflecting shield 52 and is provided on its upper end with a chuck 20 for engaging a shaft on a suitable grinding wheel, which is not shown.

Secured to and projecting upwardly from the head 11 at opposite sides, are the supporting. arms or plates 21 and 22. A work piece supporting plates 21 and 22 respectively. When these bolts are loosened, the table 23 may be tilted relatively to the horizontal or relatively to the axis of the grinding tool which is rotated by the chuck 20. When these bolts are tightened, the table is maintained in fixed relation relatively to the supporting arms or plates 21 and 22. A pointer 28 projects downwardly from the bracket 26 and is designed to cooperate with the graduated scale 30 which is carried on the face of the supporting arm or plate 22. As clearly shown in Fig. 2, the bolts 25 and 27 are projected through arcuate slots 29 formed in the brackets 24 and 26.

Formed in the supporting table 23 centrally thereof is an opening 31 through which the grinding wheel may be projected so that access may be had to the work piece which is loosely positioned on the work piece supporting table 23. A plate 32 is provided for seating in the opening 31 and serving as a closure therefor, and formed centrally in this plate 32 is an opening 33 in alignment with the axis of the shaft 19 thus providing a smaller opening through which the grinding tool may be projected and providing a supporting table for small work pieces.

Formed in the side 34 of the head 11 is a passage in which are loosely positioned the cylindrical members 36 and 37. A rod 38 is slidably and rotatably projected through the cylinder 37 and threaded into the cylinder 36. An operating handle 39 is fixedly mounted on the rod 38. Upon a threading of the rod 38 into the cylinder 36, the cylinders 3'7 and 38 are brought into approach so as to clamp the head 11 fixedly on the supporting standard 10. When a reverse threading of the rod 38 is effected, a release of the clamping is accomplished thus permitting the vertical movement of the head 11 on the standard 10 upon a rotation of the shaft 12.

A holding block 40 is slidably mounted on the bed 23 and is locked in various positions on the bed 23 by means of the bolt 41 which threads into the block 40 and which is swivelly connected to a plate 42 engaging in the groove 43. By means of this plate 42 and the screw 41, the block 40 may be clamped in its various positions and in or der to move the block 40 relatively to the bed 23 it is but necessary to unthread the screw 41 sufficient to release the clamping effect of the plate 42. Threaded in the block 40 and extended at an incline to the bed 23 is the tubular holder 44 through which is slidably projected the dressing tool 45 which may be locked in its various positions longitudinally of the holder 44 by the set screw 46. The holder 44 may be locked in its various positions of adjustment relatively to the block 40 by means of the set screw 47.

A counterweight 49 is positioned so as to move within the tubular support 10 and the housing 9 and access to the interior of the housing 9 is provided through the door 48. The counterweight 49 is connected by the cords 50 which pass over the pulleys 51 to the movable frame consisting of the head 11 and the supporting arms or plates 21 and 22.

In use, the tilt of the bed 23 relatively to the horizontal will be indicated by the pointer 28 cooperating with the graduations 30. By rotating the shaft 12, the bed 23 may be moved relatively to the grinding wheel which is connected by the chuck 20 to the shaft 19 of the motor 18'. In this movement the counterweight 49 will, of course, effect its counterbalancing purposes. By moving the table 23 bodily in this manner, the device is accommodated to work of various kinds and may be used with work pieces of various sizes and shapes while always the operator may remove the work piece for inspection without disturbing the adjustments.

In dressing the wheel, the holder 40 will be moved to approach the desired position and the member 44 may then be used for fine adjustments to bring the dressing tool 45 into engagement with the periphery of the grinding wheel. Upon a rotation of the grinding wheel and an axial movement of the bed 23 relatively to the grinding wheel, a uniform dressing of the grinding wheel throughout its length may be effected without any possibility of variation in the angularity of the dressing tool. By loosening the set screw 46, the dressing tool 45 may be rotated in the holder 44 and thus the development of flat faces on the member 45 avoided.

While I have illustrated and described the preferred form of construction of my invention, I do not wish to limit myself to the precise details of structure shown, but desire to avail myself of such variations and modifications as may come within the scope of the appended claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A grinding machine of the class described, comprising a vertically directed tubular supporting standard; a supporting plate mounted on the upper end of said standard; a longitudinally directed rack bar on the periphery of said standard; a head slidably embracing said standard; a rotatable gear carried by said head and engageable with said rack bar for effecting, upon rotation, movement of said head longitudinally of said standard in either direction; a work table carried by said head; a counterweight positioned in said standard; and flexible means connecting to said counterweight and projecting through said plate and connected to said head for normally resisting downward movement of said head on said standard.

2. A grinding machine of the class described, comprising a vertically directed tubular supporting standard; a supporting plate mounted on the upper end of said standard; a longitudinally directed rack bar on the periphery of said standard; a head slidably embracing said standard; a rotatable gear carried by said head and engageable with said rack bar for effecting, upon rotation, movement of said head longitudinally of said standard in either direction; a work table carried by said head; a counterweight positioned in said standard; flexible means connecting to said counterweight and projecting through said plate and connected to said head for normally resisting downward movement of said head on said standard; and a motor mounted on said plate, said motor being positioned below said table.

GEORGE M. LE TARTE. 

